hmm, not sure about the ray light problem, could be the lamp bases were warn or loose in which case with heat and use they could have arched their way into welding to the lamp base. Assuming of course you are talking about a Ray Light with a EXEP type lamp base on it instead of an older style with wire leads. Ray lights do tend to fall apart. Lamp bases also need infrequent replacement. Could be both are shot.
In any case if going with a ACL/Sealed beam lamp that's now low voltage, it has screw terminals at the base and you won't need the PAR 64 lamp base any more. If welded as I think you are describing, just cut it away or dissemble the lamp base on the PAR to get better access. If warn, be cautious about further use of it because it will probably melt to anything else you install it on.
Wait a moment, next to Sealed Beam lamp, you have 1,000 Watt. Do you mean some other type of say FFN type VNSP but line voltage lamp? Different things. In this case, it might be nice I expect if you can extract the ray lights from the lamps. If possible to disessemble the lamp base - such as the older Leviton style with the screws, great. Otherwise there is probably not a lot you can do. A good replacement and better lamp base would be the Sylvania type wit it's aluminum frame and 48" leads. They hold up a little better and I'm yet to see any melt down internally at the contacts. They do wear out, but not as fast.
With the ACL lamp, you might want to go with steel/high temperature ring terminals instead of the normal ones. Should not get that hot but it's nice to cover that anyway.
McMaster Carr #7437k15 Electrical Contact Cleaner w. Lubricant 16oz. Spray is the product I use for a high temperature De Oxidant/protect-ant. Craig and others are using DeOxit I believe.
I would tend to avoid normal lubricants, the idea is that your lamp base should have enough tension to lift the lamp at least for a moment or two. This way there is less chance of the lamp base popping off in transport or arcing. A lubricant might allow for the lamp base slipping off.
Spell check!!! Thanks